docs: standardize EnableConfigDiscovery description across all SDKs

Replace the per-language doc comments for EnableConfigDiscovery (and its
ResumeSessionConfig equivalent) with a single consistent description:
'Enables runtime discovery of supported configuration. Explicitly
supplied configuration takes precedence over discovered values.'

The previous wording varied by language and, in .NET/Go/Node.js/Python,
incorrectly claimed that custom instruction files are always loaded
regardless of this setting (#1887) while omitting that agent discovery
is gated by it. Rather than special-casing that one clarification in a
single language, this applies one accurate, artifact-agnostic
description everywhere EnableConfigDiscovery is documented:
dotnet/src/Types.cs, go/types.go (SessionConfig + ResumeSessionConfig),
nodejs/src/types.ts, python/copilot/client.py (create + resume),
rust/src/types.rs (fields + builder methods on both configs), and
java SessionConfig.java/ResumeSessionConfig.java setters.

Files under src/generated/ (Node.js, Java, .NET, Rust, Go rpc/zrpc.go)
are auto-generated from api.schema.json upstream and are intentionally
left untouched.

Fixes #1887

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

dotnet/src/Types.cs

@@ -2977,16 +2977,8 @@ protected SessionConfigBase(SessionConfigBase? other)
     public string? ConfigDirectory { get; set; }
 
     /// <summary>
-    /// When <see langword="true"/>, automatically discovers MCP server configurations
-    /// (e.g. <c>.mcp.json</c>, <c>.vscode/mcp.json</c>) and skill directories from
-    /// the working directory and merges them with any explicitly provided
-    /// <see cref="McpServers"/> and <see cref="SkillDirectories"/>, with explicit
-    /// values taking precedence on name collision.
-    /// <para>
-    /// Agent discovery (e.g. <c>.github/agents/</c>) is only performed when this is
-    /// <see langword="true"/>. Use <see cref="SkipCustomInstructions"/> to control
-    /// loading of custom instruction files independently.
-    /// </para>
+    /// Enables runtime discovery of supported configuration. Explicitly supplied
+    /// configuration takes precedence over discovered values.
     /// </summary>
     public bool? EnableConfigDiscovery { get; set; }
 

go/types.go

@@ -1052,13 +1052,9 @@ type SessionConfig struct {
 	// ConfigDirectory overrides the default configuration directory location.
 	// When specified, the session will use this directory for storing config and state.
 	ConfigDirectory string
-	// EnableConfigDiscovery, when non-nil, controls automatic discovery of MCP server configurations
-	// (e.g. .mcp.json, .vscode/mcp.json) and skill directories from the working directory
-	// and merges them with any explicitly provided MCPServers and SkillDirectories, with
-	// explicit values taking precedence on name collision.
+	// EnableConfigDiscovery enables runtime discovery of supported configuration.
+	// Explicitly supplied configuration takes precedence over discovered values.
 	// Nil leaves the runtime default unchanged; use Bool(false) to explicitly disable discovery.
-	// Custom instruction files (.github/copilot-instructions.md, AGENTS.md, etc.) are
-	// always loaded from the working directory regardless of this setting.
 	EnableConfigDiscovery *bool
 	// SkipEmbeddingRetrieval, when non-nil, controls embedding-based retrieval
 	// for this session. Use in multitenant deployments to prevent cross-session
@@ -1611,13 +1607,9 @@ type ResumeSessionConfig struct {
 	WorkingDirectory string
 	// ConfigDirectory overrides the default configuration directory location.
 	ConfigDirectory string
-	// EnableConfigDiscovery, when non-nil, controls automatic discovery of MCP server configurations
-	// (e.g. .mcp.json, .vscode/mcp.json) and skill directories from the working directory
-	// and merges them with any explicitly provided MCPServers and SkillDirectories, with
-	// explicit values taking precedence on name collision.
+	// EnableConfigDiscovery enables runtime discovery of supported configuration.
+	// Explicitly supplied configuration takes precedence over discovered values.
 	// Nil leaves the runtime default unchanged; use Bool(false) to explicitly disable discovery.
-	// Custom instruction files (.github/copilot-instructions.md, AGENTS.md, etc.) are
-	// always loaded from the working directory regardless of this setting.
 	EnableConfigDiscovery *bool
 	// SkipEmbeddingRetrieval, when non-nil, controls embedding-based retrieval
 	// for this session. Use in multitenant deployments to prevent cross-session

java/src/main/java/com/github/copilot/rpc/ResumeSessionConfig.java

@@ -848,12 +848,8 @@ public Optional<Boolean> getEnableConfigDiscovery() {
     }
 
     /**
-     * Sets whether to automatically discover MCP server configurations and skill
-     * directories from the working directory.
-     * <p>
-     * When {@code true}, the CLI scans the working directory for {@code .mcp.json},
-     * {@code .vscode/mcp.json} and skill directories, and merges them with
-     * explicitly provided configurations.
+     * Enables runtime discovery of supported configuration. Explicitly supplied
+     * configuration takes precedence over discovered values.
      *
      * @param enableConfigDiscovery
      *            {@code true} to enable discovery, {@code false} to disable

java/src/main/java/com/github/copilot/rpc/SessionConfig.java

@@ -1235,14 +1235,8 @@ public Optional<Boolean> getEnableConfigDiscovery() {
     }
 
     /**
-     * Sets whether to automatically discover MCP server configurations and skill
-     * directories from the working directory.
-     * <p>
-     * When {@code true}, the CLI scans the working directory for {@code .mcp.json},
-     * {@code .vscode/mcp.json} and skill directories, and merges them with
-     * explicitly provided {@link #setMcpServers(Map)} and
-     * {@link #setSkillDirectories(List)}, with explicit values taking precedence on
-     * name collision.
+     * Enables runtime discovery of supported configuration. Explicitly supplied
+     * configuration takes precedence over discovered values.
      *
      * @param enableConfigDiscovery
      *            {@code true} to enable discovery, {@code false} to disable

nodejs/src/types.ts

@@ -1915,13 +1915,8 @@ export interface SessionConfigBase {
     configDirectory?: string;
 
     /**
-     * When true, automatically discovers MCP server configurations (e.g. `.mcp.json`,
-     * `.vscode/mcp.json`) and skill directories from the working directory and merges
-     * them with any explicitly provided `mcpServers` and `skillDirectories`, with
-     * explicit values taking precedence on name collision.
-     *
-     * Note: custom instruction files (`.github/copilot-instructions.md`, `AGENTS.md`, etc.)
-     * are always loaded from the working directory regardless of this setting.
+     * Enables runtime discovery of supported configuration. Explicitly supplied
+     * configuration takes precedence over discovered values.
      *
      * @default false
      */

python/copilot/client.py

@@ -2088,13 +2088,9 @@ async def create_session(
                 including tool visibility controls.
             agent: Agent to use for the session.
             config_directory: Override for the configuration directory.
-            enable_config_discovery: When True, automatically discovers MCP server
-                configurations (e.g. ``.mcp.json``, ``.vscode/mcp.json``) and skill
-                directories from the working directory and merges them with any
-                explicitly provided ``mcp_servers`` and ``skill_directories``, with
-                explicit values taking precedence on name collision. Custom instruction
-                files (``.github/copilot-instructions.md``, ``AGENTS.md``, etc.) are
-                always loaded regardless of this setting.
+            enable_config_discovery: Enables runtime discovery of supported
+                configuration. Explicitly supplied configuration takes precedence
+                over discovered values.
             skip_embedding_retrieval: When True, skips embedding-based retrieval.
             organization_custom_instructions: Organization-level custom instructions.
             enable_on_demand_instruction_discovery: Enables on-demand instruction file
@@ -2761,13 +2757,9 @@ async def resume_session(
                 including tool visibility controls.
             agent: Agent to use for the session.
             config_directory: Override for the configuration directory.
-            enable_config_discovery: When True, automatically discovers MCP server
-                configurations (e.g. ``.mcp.json``, ``.vscode/mcp.json``) and skill
-                directories from the working directory and merges them with any
-                explicitly provided ``mcp_servers`` and ``skill_directories``, with
-                explicit values taking precedence on name collision. Custom instruction
-                files (``.github/copilot-instructions.md``, ``AGENTS.md``, etc.) are
-                always loaded regardless of this setting.
+            enable_config_discovery: Enables runtime discovery of supported
+                configuration. Explicitly supplied configuration takes precedence
+                over discovered values.
             skip_embedding_retrieval: When True, skips embedding-based retrieval.
             organization_custom_instructions: Organization-level custom instructions.
             enable_on_demand_instruction_discovery: Enables on-demand instruction file

rust/src/types.rs

@@ -1724,7 +1724,8 @@ pub struct SessionConfig {
     /// applied automatically at session creation/resume time. `None` means no
     /// explicit value is set and the runtime default takes effect.
     pub mcp_oauth_token_storage: Option<String>,
-    /// When true, the CLI runs config discovery (MCP config files, skills, plugins).
+    /// Enables runtime discovery of supported configuration. Explicitly supplied
+    /// configuration takes precedence over discovered values.
     pub enable_config_discovery: Option<bool>,
     /// When true, skips embedding retrieval for this session.
     pub skip_embedding_retrieval: Option<bool>,
@@ -2579,7 +2580,8 @@ impl SessionConfig {
         self
     }
 
-    /// Enable or disable CLI config discovery (MCP config files, skills, plugins).
+    /// Enables runtime discovery of supported configuration. Explicitly supplied
+    /// configuration takes precedence over discovered values.
     pub fn with_enable_config_discovery(mut self, enable: bool) -> Self {
         self.enable_config_discovery = Some(enable);
         self
@@ -2949,7 +2951,8 @@ pub struct ResumeSessionConfig {
     /// Controls how MCP OAuth tokens are stored for this session.
     /// See [`SessionConfig::mcp_oauth_token_storage`] for details.
     pub mcp_oauth_token_storage: Option<String>,
-    /// Enable config discovery on resume.
+    /// Enables runtime discovery of supported configuration. Explicitly supplied
+    /// configuration takes precedence over discovered values.
     pub enable_config_discovery: Option<bool>,
     /// When true, skips embedding retrieval on resume.
     pub skip_embedding_retrieval: Option<bool>,
@@ -3703,7 +3706,8 @@ impl ResumeSessionConfig {
         self
     }
 
-    /// Enable or disable CLI config discovery on resume.
+    /// Enables runtime discovery of supported configuration. Explicitly supplied
+    /// configuration takes precedence over discovered values.
     pub fn with_enable_config_discovery(mut self, enable: bool) -> Self {
         self.enable_config_discovery = Some(enable);
         self